Show beat of heart breaks silence in dead room MURRAY HILL N J A dea room which is s so quiet that a pin pia drop can be heard before the pi hits blits the floor has been created be heri I 1 ll 11 even the beat ot of a heart will br breal dead silence in the laboratory di dd signed by bell telephone labors labora tories lories tor for sound experimentation t watch tick sounds like a riveting ma fal chine in order to kill the noise ordinarily would come from air corf cod equipment engineers d bell and minneapolis honega regulator company designed elaborate control system air passes through a a labyrinth ial tunnel which traps sound in shi ishaq corners it if these precautions were not tak tam en even the air waves would create create a noise comparable to rolls ot of thu der outside i |